Jacquard mechanism for embroidering-machines.



R. ZAHN. JAGQUARD MECHANISM FOR EMBROIDERING MACHINES.

APPLICATION FILED JULY 9, 1912.

Patented Sept. 30, 1913.

COLUHIM WM!" CO. WASHINGTON, D. C.

ROBERT ZAI-IN, OF PLAUEN, GERMANY.

JAGQUARD MECHANISM FOR EMBROIDERING-MACHINES.

, Specification of Letters Patent.

Patented Sept. 30, 1913.

Application filed July 9, 1912. Serial No. 708,495.

To all whom it may concern:

Be it known that I, ROBERT ZAHN, a subj ect of the German Emperor,residing at Plauen, Vogtland, in the Kingdom of Saxony, Germany, haveinvented certain new and useful Improvements in Jacquard Mechanism forEmbroidering-Machines, of whichthe following is a specification.

It is well known with automatic embroidering machines to employ brakingmeans for the needle bars in order toprevent the easily movable Jacquardneedles from accidentally coming into a wrong position owing to erks andvibrations of the machine or that the same be not hindered in theaccomplishment of their object when the openings of the Jacquard cardincidentally are obstructed by dust particles, paper fibers or the like.

It is thus the object of the hitherto used brake for the needle bars tosecure by friction the individual needle bars in that position in whichthey are located at the time when the cylinder around which the Jacquardcard is guided is moved toward the needles. This brake, however, isadapted to brake the needle bars not only at the aforenamed periods butconstantly and there is, therefore, the drawback that the Jacquardneedles, when one and the same card is repeatedly used, will mutilatethe latter and in a short time render the considerably expensive cardsuseless.

The object of this invention is to provide a brake mechanism for theneedle bars which will not constantly but only temporarily brake theneedle bars, that is to say, for that short period during which it isnecessary to secure the needle bars against displacement, but as soon asthe needle enters the Jacquard card the respective needle bar will bereleased from the brake. Thereby the Jacquard card will be spared theunnecessary strain which it suffers under the action of the hithertoused brake.

To make my invention more clear the same is more or lessdiagrammatically illustrated in the accompanying drawing in whichFigures 1, 2 and 3 illustrate the operation of the brake mechanism inconnection with a needle bar and the Jacquard card cylinder.

The Jacquard card I) is led around the Jacquard cylinder a which iscarried by members 0 slidably mounted in bearings 01, e and operatedthrough the medium of a rod 9 in well known manner. The needles p arecarried by needle bars 1 and project toward the perforated Jacquard cardI) so that when the Jacquard card I) and Jacquard card cylinder at aremoved toward the needles p, each needle 10 which happens to lie oppositea hole in the Jacquard card remains in its normal position, but allother needles are displaced out of their normal position into an idleposition.

The brake mechanism for each needle bar f which I employ for the purposeof preventing the accidental displacement thereof, owlng to jerking orvibration of the machme, consists of a lever arm it fulcrumed on astationary part, as at 2', and carrying at its free end a roller kadapted to constantly bear on the member 0 which carries the Jacquardcard cylinder at. This member 0 15 provided with a cam shaped projectionm whereby, when the Jacquard card cylinder at 1s moved toward theneedles 1), the roller 74 will be caused to ascend the cam projection m,in consequence of which the lever 71. will be lifted from above themember 0. The lever it carries a downwardlyprojecting frame a. in whicha spring-actuated pin 0 is mounted that with its lower end is adapted topress on the needle bar f and to thereby exert a braking action thereon.

The mode of operation of the braking mechanism is as follows: Before thecylinder a reaches the needles p the braking pin 0 presses on the needlebar f and by friction securely holds it in position (Fig. 1). As soon,however, as the card has advanced so far that a needle 39 enters anopposite hole of the former, the cam projection m begins to lift thelever 71, and pin 0 through the medium of the roller is (Fig. 2) andgradually releases the brake pin 0 from the needle bar (Fig. 3). The pinwill return into its normal position onto the bar f, when the member 0moves away the Jacquard card cylinder from the needles.

l/Vhat I claim and desire to secure by Letters Patent is:

1. In an embroidering machine, the combination with a Jacquard needlebar and the Jacquard card cylinder reciprocatory supporting means, of abrake mechanism for said bar controlled by said supporting means andadapted to automatically release the said bar at the moment its needleenters a hole in the Jacquard card.

2. In an embroidering machine, the combination with a Jacquard needlebar and the Jacquard card cylinder reciprocatory supporting means, of abrake mechanism for said bar, means on said supporting means coactingwith said brake mechanism and adapted at the moment the needle of saidbar enters a hole in the Jacquard card 'to release said bar from saidbrake.

3. In an embroidering machine, the combination with a Jacquard needlebar and the Jacquard card cylinder reciprocatory supporting means, of abrake mechanism for said bar, a swinging member carrying said brakemechanism and means on said supporting means coacting with said swingingmember and adapted to automatically release the said bar from said brakeat the moment its needle enters a hole in the J acquard card.

4:. In an embroidering machine, the combination with a Jacquard needlebar and the Jacquard card cylinder reciprocatory supporting means, of amovable member, a brake for said needle bar carried by said member and acam on said supporting means coacting with the said movable member andadapted at the moment the needle of said bar enters a hole in theJacquard card to release said bar from said "brake.

5. In an embroidering machine, the combination with a Jacquard needlebar, the Jacquard card cylinder and the reciprocating means supportingthe latter, of a spring actuated brake for the said needle bar and meanson said supporting means whereby the said bar will be automaticallyreleased. at the moment its needle enters a hole in the Jacquard card.

6. In an embroidering machine, the combination with a Jacquard needlebar, the Jacquard card cylinder and thereciprocating means supportingthe latter, of a movable member, a spring actuated brake for" the needlebar carried by said member and means on the supporting-means whereby thesaid bar will be auo-matically released at the moment its needle entersa hole in the J acquard card.

7. In an embroidering machine, the combination with a Jacquard needlebar, the Jacquard card cylinder and the reciprocat ing means supportingthe latter, of a swing ing member, a spring actuated brake for said barcarried by said member and a cam on said supporting means coacting withsaid swinging member and adapted at the moment the needle of said needlebar enters a hole in the card to lift the said. brake from adapted tonormally brake the said needle bar and a cam on the supporting meansadapted to coact with said arm and to lift the latter and the saidbraking pin from the needle bar at the moment'the needle of the latterenters a hole in theJacquardcard.

In testimony whereof I afl'ix my signature in presence of twowitnesses.-

ROBERT ZAHNL Witnesses I r 7 A. CURTIS ROTH, ROBERT H. NIER.

Copies of this patent maybe obtained for five cents each, by addressingthe Gommissioner oflatents,

Washington, D. G.

